Yes, still in beta test, but that means I am looking for what can go wrong, not for any major design changes. As I have shipped over 60 stoves now, with only a few problems reported and all fixed, I am fairly happy with the design.
Plastic: yes, good stuff. NO intentions AT ALL of changing the plastic to metal. That wouldn't work, for a start.
The tiny screws: yes, they are small. Yes, you need a small Philips head screw driver to handle them, IF you intend to disassemble the connector. Such screw drivers come in little kits for a few dollars. Other stoves also have tiny screws. The ones on watches are even smaller!
The 'Main Ring' on the connector which is held in place by two screws. Yes, this can come off, but it should only do so AFTER the screws have been removed. If it is ripped off accidentally the screw holes will be damaged. Gently, gently with the rotating Spider is the message. If this has happened to anyone (or to their stove), please contact me. I will help to fix the problem. There are ways.